On 2008-04-11, Joe wrote:

On Apr 10, 10:31 am, "Pete C." wrote:

Two 8' ground rods at least 6' apart.

Not in all communities. Our power company specifies one ground rod.
Check with your power company and get acquainted with your local
building inspection department.

Well, the power company may only require one, but if you are under the
NEC, and if the ground rod is your only grounding electrode, then you
better drive two. For the NEC, one ground rod is adequate if you can
show that the resistance to ground is 25 ohms or less, but doing that
is way more expensive than driving a second ground rod, so everybody
drives two ground rods.

Cheers, Wayne